September weather forecast
Valhalla, NY

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Weather in September

The first month of the autumn, September, is still a warm month in Valhalla, New York, with an average temperature ranging between max 73.9°F (23.3°C) and min 60.6°F (15.9°C).

Temperature

The shift from August to September includes a minor decrease in the average high-temperature, lightly dropping from 81.1°F (27.3°C) to a still moderately hot 73.9°F (23.3°C). In September, Valhalla's temperature tends to fall to an average low of 60.6°F (15.9°C) during the night.

Humidity

In September, the average relative humidity is 74%.

Rainfall

September is the month with the least rainfall. Rain falls for 12.6 days and accumulates 2.2" (56mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In Valhalla, the average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:22 am and sunset at 7:27 pm. On the last day of September, sunrise is at 6:51 am and sunset at 6:38 pm EDT.

Sunshine

The average sunshine in September is 8.8h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, the maximum UV index of 4 translates into these guidelines:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Updated: Jul 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September?

In September, in Valhalla, the average high-temperature is 73.9°F (23.3°C), and the average low-temperature is 60.6°F (15.9°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in August is appraised at 84.2°F (29°C).

What is the average humidity in September?

The average relative humidity in September is 74%.

What is the driest month?

The month with the least rainfall is September, when the rain falls for 12.6 days and typically collects 2.2" (56mm) of precipitation.

How much does it rain in September?

In Valhalla, during September, the rain falls for 12.6 days and regularly aggregates up to 2.2" (56mm) of precipitation.

When it does not snow?

May through October are months without snowfall.

How many hours of daylight does Valhalla have in September?

The average day length in September is 12h and 28min.

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:22 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:38 pm EDT.

How many hours of sunshine does Valhalla have in September?

In Valhalla, the average sunshine duration in September is 8.8h.

What is the UV index reading in September?

In September, the average daily maximum UV index in Valhalla, New York, is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Valhalla, NY

Average temperature in September - Valhalla, NY
  • Average high temperature in September: 73.9°F

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (35.2°F).

  • Average low temperature in September: 60.6°F

The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (25°F).

Average pressure in September
Valhalla, NY

Average pressure in September - Valhalla, NY
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in September
Valhalla, NY

Average wind speed in September - Valhalla, NY
  • Average wind speed in September: 6.8mph

The windiest month (with the highest average wind speed) is January (9.2mph).
The calmest month (with the lowest average wind speed) is July (6mph).

Average humidity in September
Valhalla, NY

Average humidity in September - Valhalla, NY
  • Average humidity in September: 74%

The months with the highest relative humidity are February and December (76%).
The months with the lowest relative humidity are April and August (71%).

Average rainfall in September
Valhalla, NY

Average rainfall in September - Valhalla, NY
  • Average rainfall in September: 2.2"

The wettest month (with the highest rainfall) is December (3.98").
The driest month (with the least rainfall) is September (2.2").

Average rainfall days in September
Valhalla, NY

Average rainfall days in September - Valhalla, NY
  • Average rainfall days in September: 12.6 days

The month with the highest number of rainy days is July (17.5 days).
The month with the least rainy days is January (8.1 days).

Average snowfall in September
Valhalla, NY

Average snowfall in September - Valhalla, NY
  • Average snowfall in September: 0"

The month with the highest snowfall is March (3.78").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Valhalla, NY

Average snowfall days in September - Valhalla, NY
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (7.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Valhalla, NY

Average daylight in September / Average sunshine in September - Valhalla, NY
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in September
Valhalla, NY

Average sunshine days in September - Valhalla, NY
  • Average sunshine days in September: 15.8 days

The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is July (11.3 days).

Average UV index in September
Valhalla, NY

Average UV index in September - Valhalla, NY
  • Average UV index in September: 4

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in September
Valhalla, NY

Average cloud cover in September - Valhalla, NY
  • Average cloud cover in September: 34

The months with the most cloud cover are February, March and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility in September
Valhalla, NY

Average visibility in September - Valhalla, NY
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Valhalla, New York, USA

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